feat: redesign the project structure

home/linux/fcitx5/default.nix

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+{pkgs, config, lib, ... }: {
+
+  home.file.".config/fcitx5/profile".source = ./profile;
+  home.file.".config/fcitx5/profile-bak".source = ./profile;  # used for backup
+  # fcitx5 每次切换输入法，就会修改 ~/.config/fcitx5/profile 文件，导致我用 hm 管理的配置被覆盖
+  # 解决方法是通过如下内置，每次 rebuild 前都先删除下 profile 文件
+  home.activation.removeExistingFcitx5Profile = lib.hm.dag.entryBefore ["checkLinkTargets"] ''
+    rm -f "${config.xdg.configHome}/fcitx5/profile"
+  '';
+
+  i18n.inputMethod = {
+    enabled = "fcitx5";
+    fcitx5.addons = with pkgs; [
+        # for flypy chinese input method
+        fcitx5-rime
+        # needed enable rime using configtool after installed
+        fcitx5-configtool
+        fcitx5-chinese-addons
+        # fcitx5-mozc    # japanese input method
+        fcitx5-gtk     # gtk im module
+      ];
+  };
+
+  systemd.user.sessionVariables = {
+    # copy from  https://github.com/nix-community/home-manager/blob/master/modules/i18n/input-method/fcitx5.nix
+    GLFW_IM_MODULE = "fcitx";
+    GTK_IM_MODULE = "fcitx";
+    QT_IM_MODULE = "fcitx";
+    XMODIFIERS = "@im=fcitx";
+    INPUT_METHOD = "fcitx";
+    IMSETTINGS_MODULE  = "fcitx";
+  };
+}

home/linux/fcitx5/profile

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+[Groups/0]
+# Group Name
+Name=Other
+# Layout
+Default Layout=us
+# Default Input Method
+DefaultIM=rime
+
+[Groups/0/Items/0]
+# Name
+Name=rime
+# Layout
+Layout=
+
+[GroupOrder]
+0=Other
+